Tube cap



FIG. 1 is a top view of a tube cap embodying the invention.

FIG. 2 is a bottom perspective view of a tube cap embodying the invention.

FIG. 3 is a top perspective view of a tube cap embodying the invention; and,

FIG. 4 is a cross-sectional side view of a tube cap embodying the invention.

The tube cap may be constructed of colored or clear materials having visual appeal and ranging from transparent to opaque in optical transmission properties. 

CLAIM The ornamental design for a tube cap, substantially as shown and described. 